South Central Montana

Yellowstone River

The Yellowstone is the longest undammed river in the lower 48 states, flowing 692 miles from Yellowstone National Park through Paradise Valley and across the Montana plains. It is home to the native Yellowstone cutthroat trout and offers some of the most scenic fly fishing in the American West.

Current Conditions

Typical Monthly Flows

Historical median discharge (CFS) by month — Yellowstone River

830
Jan
814
Feb
910
Mar
1,300
Apr
5,780
May
10,800
Jun
6,250
Jul
2,860
Aug
1,800
Sep
1,420
Oct
1,145
Nov
940
Dec
Current monthHistorical medianSource: USGS

Overview

The Yellowstone River is a Montana icon — wild, undammed, and spectacularly productive. From its emergence from Yellowstone Lake through the dramatic Paradise Valley between the Absaroka and Gallatin ranges, this river offers a fishing experience unlike any other.

In the park, the Yellowstone supports native cutthroat trout that rise eagerly to dry flies in the meadow stretches between Yellowstone Lake and the Grand Canyon. Outside the park, the river enters Paradise Valley, where it becomes a powerful freestone river holding abundant rainbow and brown trout alongside native cutthroats.

The stretch from Gardiner to Livingston is premier float fishing water. Experienced guides row drift boats through boulder gardens and long riffles, presenting dry flies and nymphs to willing trout. The salmonfly hatch in early July turns this section into a feeding frenzy.

Below Livingston, the Yellowstone widens and warms, but still produces excellent fishing, particularly for large brown trout in fall. The river eventually reaches the Great Plains, where it supports walleye, sauger, and channel catfish — a completely different but equally rewarding fishery.

Species Present

Rainbow Trout

Rainbow Trout

The rainbow trout is Montana's most widespread gamefish, prized for its aerial acrobatics and willingness to take dry flies. Native to Pacific drainages, rainbows have been stocked extensively and now thrive in most Montana rivers. They are typically identified by their pink lateral stripe, spotted tail, and silvery body.

Brown Trout

Brown Trout

Brown trout are the wariest and most challenging trout species in Montana waters. Originally from Europe, browns have established self-sustaining populations throughout the state. They are recognized by their golden-brown coloration with dark spots surrounded by light halos. Browns grow larger than most other trout species and are famous for aggressive streamer takes.

Yellowstone Cutthroat Trout

Yellowstone Cutthroat Trout

The Yellowstone cutthroat is Montana's native trout and a species of special conservation concern. Distinguished by the distinctive red-orange slash marks under the jaw, cutthroats are generally more willing to eat dry flies than other trout species but are more sensitive to habitat degradation and competition from non-native species.

Mountain Whitefish

Mountain Whitefish

Mountain whitefish are native to most Montana river systems and are often overlooked by anglers focused on trout. These fish readily take nymphs and small dry flies and can provide excellent sport, particularly in winter when trout fishing slows. Whitefish are easily identified by their small, downturned mouths and silvery, elongated bodies.

Hatch Chart

InsectSuggested FlyJanFebMarAprMayJunJulAugSepOctNovDec
Blue-Winged Olive (Baetis)
afternoon
Parachute Adams
Salmonfly (Pteronarcys)
all day
Norm Wood Special
Golden Stonefly
all day
Stimulator
Pale Morning Dun
morning
PMD Comparadun
Caddisflies (various)
evening
Elk Hair Caddis
Green Drake
afternoon
Parachute Adams
Blue-Winged Olive (Baetis)
afternoon
BWO Emerger
Terrestrials (hoppers, beetles)
afternoon
Chubby Chernobyl

Blue-Winged Olive (Baetis): Good spring BWO hatches throughout Paradise Valley.

Salmonfly (Pteronarcys): Early July. Later than the Madison due to elevation/snowmelt.

Golden Stonefly: Overlaps with and follows the salmonfly hatch.

Pale Morning Dun: Mid-summer PMD hatches. Size 14-16.

Caddisflies (various): Consistent evening caddis hatches.

Green Drake: Sporadic but exciting. Size 10-12. Use a large Parachute Adams.

Blue-Winged Olive (Baetis): Fall BWOs on overcast days.

Terrestrials (hoppers, beetles): Hopper fishing along grassy banks is prime.

Recommended Flies

Access Points & Boat Launches

Gardiner Town Launch

Boat Launch

Launch point at the park boundary. Start of the Paradise Valley float.

Map

Corwin Springs Bridge

Wade Access

Wade access near the USGS gauge. Good pocket water and runs.

Map

Mallard's Rest FAS

Boat Launch

Popular put-in for Paradise Valley floats. Developed ramp and camping.

Map

Livingston City Launch

Boat Launch

In-town access point with improved facilities.

Map

Grey Owl FAS

Boat Launch

Mid-valley access point. Good for short float sections.

Map

Regulations

Regulations

Season: Third Saturday in May through November 30 (extended catch-and-release Dec 1 — third Sat in May on some sections). Yellowstone National Park: catch-and-release only, no lead tackle, park fishing permit required (no state license needed inside park). Gardiner to Livingston: artificial flies/lures only in upper sections, 5 trout daily combined, only 1 brown over 18". Yellowstone cutthroat: catch-and-release only throughout upper river. Hoot-owl restrictions (2 PM closure) common July–August when water temps exceed 73°F. Check FWP at fwp.mt.gov for emergency closures and section-specific rules.

Always verify current regulations with Montana Fish, Wildlife & Parks before fishing.